Ladder with folding rungs

Abstract

The present invention comprises a ladder (1) wherein the ladder (1) has the following: - a first ladder part (3) comprising: - a first stile (10) and a second stile (20); - at least one hinged rung (30) arranged between the first stile (10) and the second stile (20), wherein the rung (30) has a bearing (42) along a pivot axis (40) on the respective stiles (10, 20) such that the rung (30) is rotatably mounted relative to the stiles (10, 20); - a guide element (50) arranged on each side (32) of the hinged rung (30), wherein the respective side (30) faces the corresponding stile (10, 20); - wherein the guide element (50) has at least one recess (52);- at least one first bolt (60) which is arranged on each of the stiles (10, 20) for each of the at least one folding rung (30), wherein the first bolt (60) is designed such that it engages in a first position with each of the at least one recess (52) and holds the at least one folding rung (30) in the first position, wherein the folding rung (30) has a horizontal tread surface (34) with a depth (t) of at least 8 cm in the first position and the first bolt (60) is designed to absorb a weight force (f) acting on the at least one folding rung (30) and on the tread surface (32), wherein the first bolt (60) is further designed such that by applying a force opposite to the weight force (f) the engagement between the respective recess (52) and the first bolt (60) can be released, so that the at least one folding;

Description

The invention relates to a conductor.Conductors are known in various embodiments. In particular, a ladder is distinguished by the simple possibility of transporting from a storage location to a placement location. A ladder must thereby correspond to the conditions required at the installation site. Moreover, with respect to safety, requirements are imposed on a width of the rungs depending on a length of the ladder. In particular, as the length of the shoots increases and hence an increasing height is obtained with each shoot, the ladder must maintain a predetermined width of the shoots. However, this predetermined width can far exceed the width of the spars of the ladder, so that the width of a ladder is no longer predetermined by the spars themselves, but by the muntin which is arranged between the spars. This reduces the handling of the conductors. Even in the case of transport, this leads to a less compact arrangement. This has an effect in particular in the case of frame ladders which are characterized in that at least two ladder parts are connected to one another, wherein each of the ladder parts has shoots. This can lead in particular to the fact that in a folded state of the frame ladder the spars of the first ladder part and of the second ladder part no longer abut against one another, but are spaced apart from one another on account of the width of the shoots.Although rack ladders are known from the prior art, such rack ladders have a large packing size, so that transport is made more difficult.From CN 1 06 050 121 A a multifunctional collapsible ladder is known. WO 2021 / 033 984 A1 discloses a ladder in which the height of a support can be changed by means of a turning tool.CN 1 10 056 305 A discloses a ladder whose overall height is adjustable and can compensate for unevenness in the floor.It is an object of the present invention to provide a conductor with the smallest possible packing size.The object is achieved by the independent claim 1, which provides a conductor. The dependent claims comprise advantageous refinements of the conductors.The ladder may have various designs. A ladder is conceivable which has only a first ladder part which consists of at least two spars. However, a conductor can also be understood to mean a conductor which has a plurality of conductor parts. For example, the ladder may be an extendable ladder or a rack ladder.The conductors can be made of aluminum, for example. However, it would also be conceivable for the conductor to be made of steel, magnesium or an alloy of a metal. In particular, the spars and the foldable shoots can be made of such a material. It is provided that the spars have a rectangular cross section. In particular, the spars have a length that is a width and a depth of the spar. Accordingly, a longitudinal direction is arranged along the length. Furthermore, the spars may be hollow. This means that the spars are formed by a wall.Between the spars a foldable muntin is arranged. By intermediate the spar is meant that the rung is substantially disposed between the spars.In order for the rung to be foldable, the rung has an axis of rotation. The axis of rotation can be formed by a rod. However, it is also conceivable for the rung to have a projection, such as a pin or a cylindrical element, on the side parts facing the spars, so that this is also in engagement with the respective spars. Thus, the muntin is relatively rotatable with respect to the spars between which the muntin is received. The rung is in particular arranged relatively rotatably about the axis of rotation.It can be provided that the rung is hollow in the interior. This means that the rung is substantially formed by a wall.Accordingly, the muntin has a guide element on the sides facing the spars, which guide element forms the wall of the muntin on the sides facing the spars. The guide member is formed to have a recess. Furthermore, the guide element has a passage of the axis of rotation, so that the axis of rotation runs from the muntin bar through the guide element in the spars.The depression of the guide element is designed such that it can be brought into engagement with a first bolt which is arranged in the spars between which the muntin bar is arranged. Brought into engagement here means in particular that a force can be transmitted from the depression of the guide element to the first bolt. In particular, the force to be absorbed can be a weight force which moves onto the muntin. Furthermore, the first bolt is arranged to be movable relative to the spar. In particular, the bolt can be arranged retractable in the spar. This allows the recess to be released from the first bolt, so that after the release the muntin has become entangled and is the axis of rotation. For example, it can be provided that the bolt has a spring mechanism. The spring mechanism can be designed such that after the spring mechanism is pressed into the spars to release the engagement of the bolt in the depression, the spring mechanism subsequently presses the bolt out again after the release. Consequently, for engaging the bolts, the guide element in the spars may first be pressed and, once the depression matches the first bolt in position, the bolt may be pushed out again by the spring mechanism and engage the depression.The bolt can be cylindrical. In particular, the bolt can also be a pin. It is also conceivable for the bolt cross section to be rectangular. Furthermore, it can be provided that the bolt has one phase. The phase can in particular make it possible for the guide element to be able to press the bolt into the spars when the muntin bar is rotated about the axis of rotation. Furthermore, a further phase can provide that by acting on a force opposite to a weight force, the engagement of the bolt with the depression can be released.It is provided that the muntin has been interlaced from a second position into a first position. In the second position, the muntin is arranged such that the tread surface of the muntin is parallel or substantially parallel to the longitudinal edge of the spar. In particular, the tread surface of the muntin bar can be aligned with the tread surfaces of the further muntin bars of the ladder part. Moreover, the second position is a position different from the first position. In particular, the second position can be a position such that the muntin does not project beyond the width of the spar.In a first position, the muntin is arranged substantially horizontally. In other words, the rung is arranged parallel to the ground or horizontally. A first position can also be understood to mean that the ladder can be walked on by a human. In particular, the first position is characterized in that the muntin bar or the tread surface is wider than the spar. It is provided here that the tread surface has at least a width of 8 cm. Here, the width is a length of the tread surface in the first position, which is different from a distance between the spars. In other words, the length of the tread is the shorter side of the tread. The width can also be >8 cm or exactly 8 cm. For example, it can be provided that the width is 8.1 cm. It can also be provided that the width is 9.10 or 11 cm. The enumeration should be understood as non-exhaustive.Foldable refers in particular to a rotational movement or the rotatable muntin bar about an axis of rotation. In particular, foldable means that the muntin is held in a first position or in a second position or in a third position. Foldable thus means in particular that the rotational movement takes place by the action of an external force. In particular, the external force is different from a weight force. Preferably, the external force is opposite to the weight force. Thus, folding of the shoots can be prevented by applying a weight force such as by a human entering the shoots.According to an advantageous embodiment, each of the spars further has at least one second bolt for each of the at least one foldable shoots, such that a surface opposite the tread surfaces and / or the respective guide element at least partially rests on the second bolt in the first position.The second bolt in the respective spar of the first ladder part can be configured such that a surface opposite the wing rests on the second bolt in a first position of the foldable rung. As a result, the second bolt, in addition to the first bolt, can absorb a weight force which, for example, acts on the quelable shoots, in particular on the tread surface, by entering the tread surface. In other words, both the first pin and the second pin absorb the weight force acting on the muntin. This enables the weight force acting through the bolts to be distributed better to the spars, in particular to the walls of the spaces. As a result, the walls can be thinner, so that the weight of the conductors can be reduced. It can also be provided that the respective guide element additionally or alternatively also rests on the second bolt.By partially resting it is meant that the tread surface or the guide element does not rest on the bolt over its full surface.For example, the second bolt can be designed analogously to the first bolt. In particular, the second bolt can also have a spring mechanism, so that the second bolt can be lowered. It is also conceivable that the second bolt is designed such that it can be in engagement with the depression of the guide element, so that the muntin bar can be selectively brought into engagement in the first bolt or the second bolt by means of the depression. This has the advantage that the muntin can be adapted according to an angle of elevation of the ladder.The ladder has a second ladder part, so that the ladder is extendable. The second conductor part has the following:a third spar and a fourth spar;at least one muntin bar fixedly connected to the third spar and the fourth spar and arranged outside an intermediate space spanned by the third spar and the fourth spar;wherein each of the spars of the second ladder part is configured to receive a respective one of the spars of the first ladder part therein.In addition, the conductors also have a second conductor part in addition to the first conductor part. The first conductor part is different from the second conductor part. The second ladder part is formed by a third spar and a fourth spar. The third spar and the fourth spar are configured such that they can each accommodate the spar of the first ladder part therein at intervals. This means that, for example, the first spar can be accommodated one inside the other by the third spar and the second spar can be accommodated one inside the other by the fourth spar. In other words, this means that the external dimensions of a spar of the first conductor part are smaller than the dimensions of a spar of the second part. Consequently, the spaces of the first ladder part can be moved together relative to the spars of the second ladder part.It is further provided that a fixed muntin bar is arranged between the third spar and the fourth spar. In contrast to the foldable muntin bar, which is arranged between the first or second further spar, the fixed muntin bar is not arranged within a space which is spanned between the third spar and the fourth spar, but rather outside this space. In particular, the fixed muntin bar is arranged outside a space between the third spar and the fourth spar. This has the advantage that when the first ladder part is pushed together into the second ladder part, the foldable shoots can be pushed past the fixed shoots of the second ladder part.Furthermore, it can be provided that the first conductor part can be regulated in advanced positions with respect to the second conductor part.According to an advantageous embodiment, the bolts can be lowered in the respective spars of the first ladder part.The first bolt and the second bolt of the respective spar of the first ladder part may be countersunk. This has the advantage that when the step is pivoted from the third position into the first position, the respective bolt is first pressed into the spar by the guide element or the muntin bar and then, as soon as the depression is in a position corresponding to the bolt, the bolt can be brought into engagement with the counterbore.The third spar and the fourth spar have a cutout along a longitudinal direction of the respective facing side on a side facing the respective other spar, such that when the ladder parts are pushed together by inserting the respective spar of the first ladder part into the corresponding spar of the second ladder part, the bearing of the respective foldable muntin of the respective spar is received in a cutout of the spars on the respective facing side.It is provided that the third spar and the fourth spar each have a cutout. The cutout is arranged on the side facing the respective other spar of the second conductor part. The recess runs along a longitudinal direction of the respective spar. The longitudinal direction is the direction in which the respective spar extends longest. In other words, the longest page is therefore present. For example, it can be provided that at one end of the spar the recess has a rounded portion on one side of the recess, so that the bolts are guided into the recess. Accordingly, it is provided that the bolts and the rotation axis are received in the recess. This allows the first conductor part to be pushed together into the second conductor part.Each of the guide elements has a thickening, so that the respective muntin bar is accommodated by the thickening when the ladder parts are pushed together in the recess and is thus held in a second position.The guide element has a thickening. The thickening is formed such that it can be accommodated by the recess. The thickening is designed such that it enables locking of the respective foldable shoots in a pushed-together state of the first ladder part into the second ladder part. This has the advantage that during transport the shoots are held in a predetermined position. In particular, the thickening can be less than a wall thickness of the second conductor part. However, the thickening is at least so thick that it engages with the recess in the pushed-together state.According to an advantageous embodiment, the at least one foldable muntin of the first ladder part in the second position and the at least one muntin of the second ladder part in a retracted state form a common muntin.It can be provided that the foldable rung in the second position, which is provided for transport, in a pushed-together state, i.e. that the first ladder part has been completely or as completely as possible accommodated by the second ladder part, forms a common rung with the respective fixed rung. By this is meant that the foldable muntin bar is in alignment with the fixed muntin bar at least with respect to a surface. Furthermore, it is provided that the foldable rung does not have any offset with respect to the fixed rung in the longitudinal direction of the spars. This has the advantage that the ladder can be entered in a pushed-together state. This thus enables the use of the conductors even in the pushed-together state.According to an advantageous embodiment, the bolts are cylindrical.The bolts may have different shapes. In particular, different shapes with regard to a cross section which runs parallel to the facing side of the spar. For example, it can be provided that the cross section is triangular, circular or rectangular. The enumeration should not be understood as exhaustive. For example, it can also be provided that the bolt is cylindrical. The cylindrical configuration of the bolt has the advantage that, when the bolt is rotated relative to the depression, engagement is always possible, provided that the depression and the bolt are aligned.According to an advantageous embodiment, the bolts are brought into engagement with the respective depression by means of a spring mechanism, wherein the respective bolt is initially pressed in the respective spars by the respective guide element.It can be provided that the bolt is retractable in the respective spar. In order for the bolt to come out of the retracted position again, it is necessary for a force to bring the bolt back into the starting position. This can be effected, for example, by means of a spring mechanism. The spring mechanism may include, in one example, a spring that is secured at a predetermined position and transmits a spring force between a side of the spar and an end of the bolt to the bolt such that the bolt is returned to the initial position along its longitudinal direction. Moreover, it can also be provided that the mechanism is designed such that it not only brings the bolt back into the starting position, but also engages with the depression of the guide element. This has the advantage that the rung is automatically locked relative to the spar.According to an advantageous embodiment, the first pin and the second pin of the corresponding foldable muntin bar of the respective spar are each arranged on a movement element.Furthermore, it can be provided that one end each of the first bolt and the second bolt is connected to one another by a movement element. This means in particular that the first bolt can only be moved as a function of the second bolt. In particular, this means that the first bolt cannot be moved relative to the second bolt. The movement element can be formed from plastic, wood or metal, for example. In particular, the movement element is designed such that it can absorb forces which act on the first and on the second bolt. Furthermore, it is provided that the movement element is arranged lying inside the respective spar. This has the advantage that a force transmission is made possible between the first bolt and the second bolt.According to an advantageous embodiment, the ladder further comprises a rod guide, which is arranged lying inside in the respective spars, wherein the respective first bolt is arranged in a second recess and the respective second bolt is arranged in a respective third recess, wherein the second recess and the third recess are arranged on a side facing the respective other spar, such that each of the shoots is movable between the first position and a third position, wherein the respective first bolt of the one foldable shoots is connected in a force-fitting manner to the second bolt of the respective adjacent foldable shootsOn a side of the first spar and of the second spar facing each other, a cutout can be provided both for the first bolt and for second bolts. The respective recess specifies a range of movement of the first bolt and of the second bolt. In this case, the first bolt is furthermore connected to the second bolt by means of the movement element, such that the first bolt and the second bolt can be moved jointly along the respective recesses. This has the advantage that the bolts and thus also the foldable muntin can additionally be brought into a third position, which is different from the first position and the second position.It is further provided that the ladder has a rod guide. The rod guide is arranged lying on the inside in each case in the first spar and the second spar. Furthermore, the rod guide is designed such that a respective rod is connected to the first bolt of a movement element and a second bolt of an adjacent movement element. In particular, it is provided that the rod guide is designed such that it can absorb a force which acts on the first and the second bolt. This means in particular that the rod guide is in a fixed position relative to the movement element. In other words, the rod guide is not relatively movable with respect to the moving member. Although it can be provided that the rod guide is movable relative to a wall of the spar, the rod guide is not movable relative to the bolts or the movement element. This allows the rod guide to absorb a force acting on the bolt.According to an advantageous embodiment, the respective rod guide can be fixed jointly or individually in each of the spars in the first position or the third position, such that the rod guide absorbs a weight force acting on the at least one foldable muntin bar by means of the respective bolts.The rod guide can have a fixing. In particular, it can be provided that each of the movement elements has a fixing. Furthermore, it can be provided that each of the rod guides has a single fixation configured independently of one another. However, it is preferably provided that the rod guides of the respective spar have a common fixing. In particular, the fixing is designed such that the fixing prevents a movement of the rod guide relative to the spar. This means that the fixing can absorb a force which acts on the respective shoots and is transmitted to the rod guide by the bolts and the moving elements. For example, such a fixing can be effected by means of a bolt or a hook.According to an advantageous embodiment, the at least one foldable muntin is foldable only when it is outside the recess by pulling the first ladder part out of the second ladder part.This has the advantage that the collapsible mugable muntin is held in the second position, so that in the second position only an undesired movement of the muntin, such as, for example, a rattle during transport, is prevented.According to an advantageous embodiment, one end of the respective spars of the first ladder part is connected to a respective end of a third ladder part, which corresponds to the second ladder part, and / or a fourth ladder part, which corresponds to the first ladder part, such that the ladder parts form a bow ladder.In an advantageous embodiment, two first conductor parts, which are referred to below as first conductor part and fourth conductor part, wherein the fourth conductor part corresponds to the first conductor part, can be connected in such a way that they together form a bracket conductor. In particular, it can be provided that the respective ends of the first conductor part and of the fourth conductor part are connected to one another by means of a joint. The joint can be configured, for example, such that the fourth conductor part is movable about the joint relative to the first conductor part. Furthermore, the joint can have a locking mechanism, so that the first conductor part can be locked relative to the fourth conductor part, i.e. can be held in a previously brought position. For example, it can be provided that only the first conductor part is connected to the fourth conductor part. Such a combination produces a jack ladder. Furthermore, it can be provided that in addition to the first conductor part, a second conductor part is also arranged. This has the advantage that the frame ladder can be pulled out at least on one side. Furthermore, it can also be provided that the fourth ladder part also has a third ladder part, so that both sides of the frame ladder can be extended.A bow ladder has the advantage that it is inherently on the ground and does not have to be based on another object. This extends the field of application of such a conductor.According to an advantageous embodiment, the foldable shoots of the first ladder part and of the fourth ladder part are arranged in a first position or the foldable shoots of the first ladder part are arranged in the first position and the foldable shoots of the fourth ladder part are arranged in the third position, wherein the tread surfaces of the foldable shoots of the first ladder part and of the fourth ladder part are substantially horizontal.The bars of the first conductor part and the fourth conductor part can be moved independently of each other. For example, it can be provided that the shoots of the first conductor part are provided in a first position and the shoots of the fourth conductor part are provided in a second position. It can also be that the shoots of the first conductor part are in a first position and the shoots of the fourth conductor part are in a third position. In other words, the positions of the rungs of the first ladder part and the fourth ladder part can be adjusted independently of each other. It is preferably provided that the bars of the first conductor part and of the fourth conductor part are arranged in a first position. However, it can also be provided that the shoots of the first conductor part are arranged in the third position and the shoots of the fourth conductor part are arranged in the second position. It can preferably be provided that the tread surfaces of the bars of the first conductor part and of the fourth conductor part are arranged parallel to one another. In particular, it can be provided that all the shoots, i.e. the foldable shoots are arranged in a position different from the second position and the fixed shoots are arranged parallel to one another.The invention is explained in more detail by way of example with reference to the attached figure. It shows: FIG. 1 is a schematic illustration of a foldable rung, FIG. 2 shows a schematic illustration of a first conductor part, FIG. 3 shows a schematic illustration of foldable shoots with a rod guide FIG. 4 shows a schematic illustration of a first conductor part with an inner rod guide FIG. 5 shows a schematic illustration of a first conductor part and a second conductor part with a cutout FIGS. 6a-6c show a schematic representation of different arrangements of the first conductor part relative to the third conductor part FIGS. 7a-7d show a schematic picture sequence of a folding over of the foldable shootsThe exemplary embodiment explained below is a preferred embodiment of the invention. In the exemplary embodiment, the described components of the embodiment each represent individual features of the invention that are to be considered independently of one another and that develop the invention in each case also independently of one another and are therefore also to be considered as part of the invention individually or in a combination other than the combination shown. Furthermore, the described embodiment can also be supplemented by further features of the invention that have already been described.In the figures, identical reference numerals designate functionally identical elements.FIG. 1 shows a foldable muntin 30, the foldable muntin 30 having a guide element 50 on each of two opposite sides. Each of the guide members 50 has a recess 52. Furthermore, each of the guide elements 50 has a thickening 55. Preferably, the thickening 55 may be arranged in a middle of the guide element 50. The thickening 55 can extend in particular from a center of the guide element to an edge, in particular to a tread 34. In particular, the depression 52 can be arranged in the thickening 55. Furthermore, an edge or the opposite edges of the thickening can run parallel to the tread 34. The tread surface 34 can extend in particular along a longest side of the guide element 50. In particular, a length of the tread surface 34 may correspond to the length of the longest side of the guide element 50. In particular, the tread surface 34 may have a length of at least 8 cm. The foldable rung 30 further includes a pivot axis 40. The rotation axis 40 passes through the guide member 50, and in particular, the recess 52 and the rotation axis 40 may be disposed along a direction parallel to the tread 34. The recess 52 is configured to be engaged with the first bolt 60. In one example, the bolt 60 may be part of a movement member 110. In particular, it can be provided that the first bolt is not part of the movement element 110. It is further contemplated that the recess 52 is relatively rotatable about the bolt 60. For example, the depression can be configured cylindrically such that a cylindrical first bolt 60 can rotate in the depression 52. Furthermore, the movement element 110 can have a second bolt 62. In one exemplary embodiment, it can be provided that the first bolt 60 is in engagement with the depression 52 and a side opposite the tread surface rests on the bolts 62, so that the bolts 60 and 62 hold the step.FIG. 2 shows a ladder 1, in particular a first ladder part 3. the first ladder part 3 has a first spar 10 and a second spar 20. FIG. 2 shows in particular a side view of the spars, so that the first spar 10 or the second spar 20 is shown as desired. The spar 10, 20 is connected to the rung 30. In particular, the spar 10, 20 receives the rung 30 by means of a rotation axis 40 relatively rotatably with respect to the spaces 10, 20. The axis of rotation 40 can be accommodated, for example, by insert 42 in the spar 10, 20.First, the portion of Figure 2 will be described showing the rung 30 in a third position in which the tread 34 is parallel to the edge of the spar 10, 20. In this case, the recess 52 of the guide element 50 is not in engagement with one of the bolts 60, 62, and in particular a surface of the rung 30 which is perpendicular to the tread surface 34 and in the third position is substantially horizontal or runs horizontally in the figure has a width which is less than the width of the spar. In particular, no muntin 30 in the third position may be narrower than the spar 10, 20.Moreover, FIG. 2 also shows the rung 30 in a second position. In this case, the rung 30 is also connected to the spars 10, 20 via a pivot 40. By applying an external force, the rung 30 can be pivoted from a third position to a first position. Furthermore, the tread surface 34 opposite the side of the rung 30 rests on the second pin 62.It is also shown that the first bolt 60 is movable in a first recess 12 and the second bolt 62 is movable in a second recess 22. In particular, the first bolt is guided through the recess 12 and the second bolt is guided through the recess 22. In particular, the recess can specify a range of movement of the respective bolts. A rod guide 120, not shown here, is designed to hold both the first bolt 12 and the second bolt 22 in position.In a second position, which is not shown here, the bolts 60, 62 can be moved along the recess in such a way that they are held at the other end of the recess 12, 22. In this position, the tread surface 34 is substantially perpendicular to an edge of the spar.FIG. 3 shows a schematic illustration of foldable shoots 30 with a bar guide 120. FIG. 3 shows a plurality of foldable bars 30, which are arranged between the not-shown spars 10, 20. The foldable shoots 30 have the features described in FIG. 1.As already explained, the axis of rotation 40 of the rung 30 is arranged in the respective spaces 10, 20 by means of an insert 42. In the third position shown here, the bolt 60 is not in engagement with the depression 52. The moving member 110 connects the respective parts of the rod guide. In particular, it can be provided that one rod is connected to the first bolt of the movement element and another rod is connected to the second bolt of the movement element. In this case, it is provided in particular that the first rod is not connected to the second bolt 62 and the second rod is not connected to the first bolt 60. In particular, it can be provided that the movement element 110 is displaceable along the longitudinal direction of the spars 10, 20. It can also be provided that the rod guide is formed by a single element in which the movement element 110 with the bolts 60, 62 is arranged. By configuring the rod guide 120 as a single element, a rotation of the respective rod relative to one another can be prevented.In particular, it is provided that the rod guide 120 is arranged both in the first spar 10 and in the second spar 20. This makes it possible to prevent tilting of the rung 30 during folding over.Furthermore, it is provided that the rod guide 120 has a fixing, not shown here. This is necessary in order that the bolts 60, 62, which are arranged in the recesses 12, 22, can be fixed, so that this bolt can absorb a weight force (f) which acts in engagement on a floor, which is not shown here.FIG. 4 shows a schematic illustration of a first conductor part 10 with an inner rod guide 120. In particular, FIG. 4 shows features similar to FIG. 3, it being evident that the rod guide is arranged on the inside in the spar 10, 20. In particular, it can be provided for this purpose that the spars 10, 20 are hollow.FIG. 5 shows a schematic illustration of a first conductor part 3 and a second conductor part 5 with a cutout 72, 82. The first conductor part 3 has a first spar 10 and a second spar 20. In this case, one of the spars 10, 20 is shown, for example, in FIG. 5. Furthermore, the second ladder part 5 has a third spar 70 and a fourth spar 80. For example, one of the spars 70, 80 is shown in FIG. 5. The bars 70, 80 have a recess 72, 82. The recess is arranged along an inner side of the spars 70, 80. The inner side of the spars is the spar side 100 facing the respective other spar 70, 80. The recess 72, 82 extends along a longitudinal direction of the spar 70, 80. In particular, the recess 72, 82 is configured such that the recess 72, 82 can receive the thickening 55 of the foldable rung 30 when the foldable rung 30 is in the third position. In particular, during the process of being pushed together, which involves pushing the first ladder part 3 into the second ladder part 5 or the first spar 10 into the third spar 70 and the second spar 20 into the fourth spar 80, the depression 55 can be received in the cutout 72, 82. In particular, the rung 30, which is arranged in the third position, can be guided along the recess 72, 82 by means of the depression 55. This prevents unwanted movement of the rung 30 in the third position. Specifically, the third position is a position in which the rung 30 is locked so that the ladder 1 can be transported without an unwanted movement of the rung 30.The second ladder part 5 further comprises a fixed muntin 90 The fixed muntin 90 is arranged between the third spar 70 and the fourth spar 80. In particular, the fixed muntin 90 is arranged such that it is arranged outside an intermediate space of the spars 70, 80. Preferably, the fixed muntin 90 is arranged such that, upon a pushing together, the foldable muntin can be pushed past the fixed muntin 90 in a third position. For example, it can be provided that a surface perpendicular to the tread surface, which in the third position is a substantially horizontal surface, is aligned with the substantially horizontal surface of the fixed muntin bar. Thus, the ladder 1 can be used in a retracted state.FIGS. 6A-6C show a schematic representation of various arrangements of the first conductor part 3 relative to the third conductor part 130. The second conductor part 5 is not shown here.FIG. 6A shows a bow ladder. The jack ladder is connected by a first ladder part 3 which is connected to the third ladder part 130 by means of a joint movable relative to each other. The hinge may include a detent such that the first conductor portion is fixed in an advanced position relative to the third conductor portion. In particular, both the first conductor part 3 and the third conductor part 130 have shoots 30. The steps 30 are each arranged such that the tread surface 34 is horizontal. In particular, the tread surfaces 34 of the respective conductor parts 3, 130 are in alignment. The bars 30 are arranged in the first position.FIG. 6B also shows a bracket conductor, wherein the first conductor part 3 forms a substantially L-shape with the third conductor part 130. In this case, one end of the third conductor part 130 can be based, for example, on a wall. Here too, the joint fixes the third conductor part 130 relative to the first conductor part 3. In this respect, the shoots 30, in particular the tread 34, are arranged substantially horizontally with respect to a floor which is not shown here. To this end, the rung 30 of the third ladder part is arranged perpendicular to the ground. In particular, the tread surface of the bars 30 of the first conductor part 3 is arranged perpendicular to the tread surface 34 of the bars 30 of the third conductor part 130. Both the rung 30 of the first ladder part 3 and the rung of the third ladder part 130 are in the first position.FIG. 6C also shows a bracket conductor in which the first conductor part 3 with the third conductor part 130 is arranged such that the two conductor parts form a straight line. In order that both the shoots 30 of the first ladder part 3 and the shoots 30 of the third ladder part 130 are substantially horizontal, the shoots of the first ladder part 3 are arranged in the first position, whereas the shoots of the third ladder part are arranged in the second position. In other words, the tread surfaces 34 of the bars 30 of the first conductor part 3 and the bars 30 of the third conductor part 130 are parallel to each other.FIGS. 7A-7C schematically show, in a sequence of pictures, a folding over of the foldable shoots 30.FIG. 7A shows a bracket conductor. The frame ladder has a first ladder part 3 which is arranged such that it can be received in the spars 70, 80 of the second ladder part 5. Furthermore, the conductors have a third conductor part 130, which is arranged in a receivable manner in the fourth conductor part 140. It is not shown here that the first conductor part 3 is connected to the third conductor part 130. The rungs 30 of the first and third ladder parts are in a first position. The pin 60 is in engagement with the depression 52 and the side opposite the tread surface 34 lies on the pin 62. Further, Fig. 7A shows a muntin 30 with the tread of muntin 30 in alignment with the fixed muntin 90. Further, the folding out of this muntin 30, which is currently in alignment with the tread surface of the fixed muntin 90, will be described.In order to come from the position of the rung 30 shown in Fig. 7A to the position of the rung 30 shown in Fig. 7C, the first ladder part 3 can be extracted from the second ladder part 5. In particular, it can also be provided that only the first conductor part is pulled out of the second conductor part, whereas the third conductor part is not pulled out of the fourth conductor part 140. By pulling out the muntin 30, the thickening 55 leaves the recess 72, 82, so that the muntin 30 is now rotatable about the axis of rotation 40. In particular, the rung 30 is rotatable in a clockwise direction such that the recess 52 is engaged with the pin 60.FIG. 7C shows the rung 30 as the tread 34 moves from a third position, wherein the tread is disposed substantially parallel to the edge of the spar 10, 20, to the second position. The rotation can be effected by the action of an external force. In particular, the turning of the muntin 30 is only possible when the depression 55 has left the recess 72, 82. Leaving means here that the recess 72, 82 releases the thickening 55.FIG. 7B shows the rung 30 in the second position. The step surface 34 of the muntin is substantially horizontal to the ground. Specifically, the steps of the steps 30 are arranged parallel to a steps of the fixed steps 90. In this case, FIG. 7D also shows that a pulling out of the first conductor part 3 from the second conductor part 5 is independent of the pulling out of the third conductor part 130 from the fourth conductor part 140.List of reference characters1 Ladder 3 First ladder part 5 Second ladder part 10 First spar 12 Second cutout 14 End 20 Second spar 22 Third cutout 24 End 30 Foldable rung 32 Side of the foldable rung 34 Tread 40 Axis of rotation 42 Bearing 50 Guide element 52 Depression 55 Thickening 60 First bolt 62 Second bolt 70 Third spar 72 Cutout 80 Fourth spar 82 Cutout 90 Fixed rung 100 Facing spar side 110 Movement element 120 Rod guide 130 Third ladder part 140 Fourth ladder part t Depth f Weight force

Claims

Ladder (1), the ladder (1) comprising: - a first ladder part (3) comprising: - a first spar (10) and a second spar (20); - at least one foldable rung (30) arranged between the first spar (10) and the second spar (20), the rung (30) comprising a bearing (42) along an axis of rotation (40) on the respective spars (10, 20) such that the rung (30) is supported relatively rotatably to the spars (10, 20); - each a guide element (50) arranged on a respective side (32) of the foldable rung (30), the respective side (32) facing the corresponding spar (10, 20), - the guide element (50) comprising at least one indentation (52); - at least one first pin (60) arranged on each of the spars (10, 20), 20) is arranged for each of the at least one foldable shoots (30), wherein the first pin (60) is designed such that it is in engagement with the at least one depression (52) in a first position and holds the at least one foldable shoots (30) in the first position, wherein the foldable shoots (30) in the first position have a horizontal tread (34) with a depth (t) of at least 8 cm and the first pin (60) is designed to absorb a weight force (f) which acts on the at least one foldable shoots (30) and on the tread (34), wherein the first pin (60) is furthermore designed such that the engagement between the respective depression (52) and the first pin (60) is releasable by action of a force opposite to the weight force (f), such that the at least one foldable muntin bar (30) is foldable into a second position, wherein in the second position the respective tread surface (34) is arranged substantially parallel to the spars (10, 20), wherein the ladder (1) comprises a second ladder part (5) such that the ladder (1) is extendable, wherein the second ladder part (5) comprises: - a third spar (70) and a fourth spar (80); - at least one muntin bar (90), which is firmly connected to the third spar (70) and fourth spar (80) and is arranged outside a space spanned by the third spar (70) and fourth spar (80); wherein each of the spars (70, 80) of the second ladder part (5) is configured to receive in each case one of the spars (10, 20) of the first ladder part (3) therein, wherein the third bar (70) and the fourth bar (80) have a cutout along a longitudinal direction of the respective facing side (100) on a side facing the respective other bar (70, 80), such that when the ladder parts (3, 5) are pushed together by inserting the respective bar (10, 20) of the first ladder part (3) into the corresponding bar (70, 80) of the second ladder part (5), the bearing (42) of the respective foldable bar (30) of the respective bar (10, 20) is received in a cutout (72, 82) of the bars (70, 80) on the respective facing side (100), wherein each of the guide elements (50) has a thickening (55), such that the respective bar (30) is received by the thickening (55) when the ladder parts (3, 5) are pushed together in the cutout (72, 82) and is thus held in a second position.Ladder (1) according to claim 1, wherein each of the spars (10, 20) further comprises, for each of the at least one foldable muntin bar (30), at least one second pin (62), such that a surface opposite the tread surface (34) and / or the respective guiding element (50) at least partially rests on the second pin (62) in the first position.Ladder (1) according to one of the preceding claims, wherein the bolts (60, 62) can be lowered in the respective spars (10, 20) of the first ladder part (3).Ladder (1) according to one of the preceding claims, wherein the at least one foldable muntin (30) of the first ladder part (3) in the second position and the at least one muntin (90) of the second ladder part (5) in a retracted state form a common muntin.Conductor (1) according to one of the preceding claims, wherein the bolts (60, 62) are formed cylindrically.Ladder (1) according to one of the preceding claims, wherein the bolts (60) are brought into engagement with the respective depression (52) by means of a spring mechanism, wherein the respective bolt (60) is initially pressed in the respective spars (10, 20) by the respective guide element (50).Ladder (1) according to claim 2, wherein the first pin (60) and the second pin (62) of the corresponding foldable muntin bar (30) of the respective bar (10, 20) are arranged on a movement element (110).Ladder (1) according to claim 7, wherein the ladder (1) further comprises a rod guide (120) arranged inside the respective spars (10, 20), wherein the respective first bolt (60) is arranged in a respective second recess (12) and the respective second bolt (62) is arranged in a respective third recess (22), wherein the second recess (12) and the third recess (22) are arranged on a side (100) facing the respective other spar (10, 20), such that each of the shoots (30) is movable between the first position and a third position, wherein the respective first bolt (60) of the one foldable shoots (30) is non-positively connected to the second bolt (62) of the respective adjacent foldable shoots (30).Ladder (1) according to claim 8, wherein the respective rod guide (120) can be fixed together or individually in each of the spars (10, 20) in the first position or the third position, such that the rod guide (120) absorbs a weight force (f) acting on the at least one foldable muntin bar (30) by means of the respective bolts (60, 62).Ladder (1) according to one of the preceding claims, wherein the at least one foldable muntin bar (30) is foldable only when it is outside the recess (72, 82) by pulling the first ladder part (3) out of the second ladder part (5).Ladder (1) according to claims 1, 2 and any of claims 3 to 8, wherein an end (14, 24) of the respective spars (10, 20) of the first ladder part (3) is rotatably connected relative to each other to a respective end of a third ladder part (130) corresponding to the second ladder part (5) or a fourth ladder part (140) corresponding to the first ladder part (3), such that the ladder parts (3, 5, 130, 140) form a bock ladder.Ladder (1) according to claim 11, wherein the foldable shoots (30) of the first ladder part (3) and the fourth ladder part (140) are arranged in a first position or the foldable shoots (30) of the first ladder part (3) are arranged in the first position and the foldable shoots (30) of the fourth ladder part (140) are arranged in the third position, wherein the tread surfaces (34) of the foldable shoots (30) of the first ladder part (3) and the fourth ladder part (140) are substantially horizontal.

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